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In the process of flattening and straightening, the iron oxide scale of beam steel is broken, dropped out and pressed into surface of steel coils so that pockmarks of different sizes are formed on surface, which seriously affects the appearance quality of products. In this paper, the relatedness between such process parameters as the inlet temperature of finishing rolling, rolling speed, cooling rate and coiling temperature as well as thickness and structure of iron oxide scale is researched. The results showed that the thickness of iron oxide scale was increased with the increase of inlet temperature of finishing rolling when it was below 980 ℃; the faster the rolling speed, the thinner the iron oxide scale on surface of strip steel. The defect of pockmarks on surface of beam steel is effectively controlled by optimizing the heating schedule, increasing rolling speed as well as optimizing laminar cooling rate and coiling temperature.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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